Grinding fixture



Jan. 5, 1932. E. A. SPRUNG 1,839,810

GRINDING FIXTURE Filed April 13, 1929 INVENTOR ATTORN EYS to both hand operated and power driven wheel; and

Patented m 5 1932: t issasm "STATES PATENTI E v EDMUN D A. SPRUNG, OF DETROIT, MICHIGAN 7 GRINDING FIXTUR Application filed April 13, 1929. Serial No. 354,799. I

The present invention pertains to a novel -work supporting fixture attached to a bench fixture for supporting work such asvalves, or other supporting means; drills or any other objects of like character 7 Figure 3 is anend view or the work sup- 7 and nature, ina position facilitating their porting fixture; r

5 being ground by portable hand operated Figure 4 is a top plan view of my invention grindingmachines or power driven grinding illustrating the manner of installation relamachines. tive to a power driven'grinding wheel;

Asa primary object my invention'aims to Figure 5 is a side elevation of my invention devise awork supporting fixture adaptable as equipped to a power driven grinding i grinding wheels, which fixture supports a J Figure 6jis an alternative device for supvalve of thetype employed in'an internal porting the work. i i combustion engine in the proper angle of Like characters areemployed todesignate contact with the grinding wheel and perthe corresponding parts throughout.

- 15 'mits and facilitates its rotation while incon- The numeral 1 indicates a hand operated tact with the grinding surfacearThedevice grinding wheel, which may be of any conis designed so "that 'it supports thevalve stem ventional type,;supported upon a convenient in such a manner that the valve head may be work bench 2 by the'usulal clamping memr ground at the true angle desired providing bers supplied as parto'f the device. In conthe 'state of the stem whichcommonlyis junction with a wheel of this type I supply known to become warped-aftefbeing used for a work supportingfixture comprising a post a period of time is not contort-ed to such as 3 formed with a base member 4: having arslot extentthat grinding would be impractical. 5 through which a screw. or bolt 6 is passed Another object of my-invention is to d and inserted in the bench 2 for securing the vise afixture for supportingwor'k in conjuncpost 3 to the latter. This manner ofattachtion with a hand operated portable grinding ment permits. adjustable movement of the wheel which will facilitate the grinding of postB by loosening the screw 6 so thatthe the valves used in the internal combustion post may belocated at the desired point in the engine. in a boat, which valves have become proper spaced relation to the wheel 1.

7 defective while on a cruise: This feature The post 3 is drilled longitudinally at7 bviously overcomes a, great inconvenience tO'SIlPPOI'i) a lOOlt' 8 which is inserted therein found in cruising when the valves become dend a sc ew 9 is t readed in the post to engage fective and it becomes necessaryto enter the the bolt 8 so that by tightening the screw 9 nearest port with the likelihood that there the bolt is frictionally held in any desired ill b no ui ment at the'port suitable for vvertical position in the drilled bore '7 by the grinding the valves. 'A device of this charscrewr9'which, however, does not positively act'er' becomes of inestimable value while prevent rotary movement and therefore excruising through uninhabited parts and erting rotary pressure through the members when it becomes necessary to travelformiles which are described as the descriptlon pro- .in order to reach a point where the defect in gresses is a simple proceduredue to the manthe valves maybe corrected; nerin-which the said members serve as a le- With these and other objects in view my ver andthe bolt Smay be rotated in amanner invention is thereinafter set forth and more and for the'purpose which later becomes 5 particularly '-pointedout in the appended apparent. The upper endof the bolt 8 exclaim, reference beinghad to the accompanytendsabove the post 2 and 18 provided with ing drawingsfin which Y v 1 ahead 10 formed'with cars 11 to extend up- Figure 1 is a top plan View of my invention wardly and spaced to receive the ear 12 proattached in the proper relation to a hand opjecting downwardly from the unders de of erated grinding wheel; 2 r i the block 13.

50 Figure, 2 is a broad-sideelevation of the T The block 13 is substantiallyrectangular in shape and has a groove 14 formed on the 17 are provided with downwardly extending lugs 22 which are formed with grooves 23 of like nature and opposing the groove 14.

' The valve which is'to be ground is laid with the stem 24 restingin the groove 14 in the head 13 and the bars 17 are then swung upon the screws so that they lie transverse- 'ly' over the stem in which position the slot 19 partially surrounds the screw 20 so that by tightening the latter the lug 22 having the groove 23 is moved into contact with the upper side oi the valve stem 24. The block is then swung radially by means of the'bolt 8 in the bore 7 so that; the valve headf25 is brought intocontact with the grinding wheel 1 while the axis of the stem is lying at an angle of 45 to'the .axis of the. wheel. The

valve head is then-swung away from contact with the wheel and the screws 15 and. 20. are

tightened to maintain the stem in this position while a handle 26 is-placed over the end of the stem for the purpose of rotating the stem.

' Theha-ndle 26 has a circular hub adapted to surround the valve stem and is'provided with a set screw 27 extendingradially through the hub to engage the valve stem so that rotation of the handle rotates-the valve. The

handle 26 is moved onthe stem towards the head until the screw 28 extending through the .hub' engages against a washer 28 which in turn engages the end of block 13 andthen the screw .26 is tightened to engage the stem. This leaves'the valve supported so that it may be swung into contact with the wheel to permit the head being ground at 45, the amount which is to be ground olf being determined by-slight rotation of the screw 28 whose endis in centactwith the block 13, the

turning of the screw causing the valve stem to be moved longitudinally.

To'obtain the proper 45 angle it might be found advisable to graduate the upper end of thepost 3 and the head 10 orthebolt 8 by markings whichwill indicate the angle which the valve head is. being grooved; By supplying a pivotal connection between the block 13 and head lOby means of theears 11 and 12 through whicha bolt'29 is passed it becomes possible/to obtain 'acontact with the periphery' of the wheel which will grinda't 45? It is also found desirable at times'to graduate the ears 11 and 12 so that the-blok 13 maybe definitely secured with the groove 14 on a parallel plane to the axis of the wheel 1 or in other words parallel to the surface of the supporting bench.

In Figures 4 and 5 a power driven grinding wheel is provided and mounted upon a conventional stand having a rod 30 supported by arms 31 attached to the supporting frame.

.To mount the present fixture to a wheel showing these characteristics the lower end of the post 3 isprovided'with a pivoted connecting means 32 and a bolt 33 for clamping the post to the rod 30.

In Figure 6 is illustrated an alternative de-' vice for receiving the stem 24 of the valve which comprises two blocks 34 and 35, the block 35 havingan ear 36 to be received between-the ears 11 onthe head 10, and'also having a drilled hole 37 to accommodate the bolt 29. The blocks are provided with semi-circular grooves 38 and 39 which combine to form circular openings of different sizes-to accommodate valves having stems of varying diameters. The two blocks are secured together by screws 40 provided with wing nuts 41. a portion of each block being bored to receive coiled springs. 42 adapted to force the blocks apart when the thumb screws 41 are released.

I Byexperimentation it has been found that? a greater smoothness and regularityingrin ding the' valve'head is attained by employingfa rod- 42, recelved in a drilled boss 43 on the lower side of the head 13, the rod being held in m0 any desired position by aset screw44, this being clearly illustrated in Figure 2 of the drawings The rod 42 is provided with a goose-nec'k 45 and a bent back portion 46 upon which is slidably mounted a sleeve 47, backed.

by spring 48 which exerts pressure outwardly on the sleeve; The rod 42 is held by the set screw so that the sleeve 47 is in contact with the valve head 25 with the spring 48 slightly compressed wherebythe sleeve exerts resilient pressure against the valve'head. Th s construction providlng the resilient pressure against the valve head tends to pre ventvibrationofthe valve head while it is in contact with the grinding wheel and permits a smoother ground surface to be obtained.

It becomes apparent from the description that the fixture for supporting the work is of such nature and qualification that it maybe employed infactory or workshop without interfering with the ordinary use of the grinding wheel. Its most desirable feature is,

however, that it may be 'conveniently carried in a boat to be used in caseof an emergency in which it is found necessary that the'valves should be ground while on a cruise. V

The deviceis illustrated and describedas a fixture for grinding valves for internal combustion engines, but it is not limited to that use alone as it may also'be used for supporting various other articles at grinding angles.

Specific structural embodiments have been illustrated and described but it is to be understood that various alterations may be made in the details of construction without departing from the spirit of my invention as depicted in the appended claim.

What I claim is I i The combination with a grinding wheel, of a vertically extending post adjustably se- 10 cured in spaced relation thereto, a grooved block mounted to swivel and rotate on said post, adjustable work retaining members on said block adapted to engage the stem of a valve to secure the latterthereon, a goose neck rod adjustably secured to the bottom of said block to extend outwardly beyond the head of said valve, a sleeve slidably mounted on a portion of said rod that is'bent back towards said valve head, and a spring surrounding a portion of said rod and engaging said sleeve in a manner to force it into contact withsaid valve a head.

In testimony whereof I aflix my signature.

EDMUND A. SPRUNG. 

